Marcel Salathé is a Swiss digital epidemiologist and an associate professor at EPFL, where he holds a double appointment at the School of Computer and Communication Sciences and the School of Life Sciences. He serves as the PI of the Lab of Digital Epidemiology and is the co-director of the EPFL AI Center. His research focuses on epidemiological problems, particularly contact networks, and he analyzes digital data streams like Twitter and mobile phone data to gain epidemiological insights.